<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="./static/css/inputnumber.css" />
    <link rel="stylesheet" href="./static/css/index.css" />
    <title>购物车</title>
  </head>
  <body>
    <div class="app-container" id="app">
      <!-- 顶部banner -->
      <div class="banner-box">
        <img src="http://autumnfish.cn/static/fruit.jpg" alt="" />
      </div>
      <!-- 面包屑 -->
      <div class="breadcrumb">
        <span>🏠</span>
        /
        <span>购物车</span>
      </div>
      <!-- 购物车主体 -->
      <div class="main" v-if="fruitList.length >0">
        <div class="table">
          <!-- 头部 -->
          <div class="thead">
            <div class="tr">
              <div class="th">选中</div>
              <div class="th th-pic">图片</div>
              <div class="th">单价</div>
              <div class="th num-th">个数</div>
              <div class="th">小计</div>
              <div class="th">操作</div>
            </div>
          </div>
          <!-- 身体 -->
          <div class="tbody">
            <div
              class="tr"
              :class="{active:item.isChecked}"
              v-for="(item,index) in fruitList"
              :key="item.id"
            >
              <div class="td">
                <input type="checkbox" v-model="item.isChecked" />
              </div>
              <div class="td"><img :src="item.icon" alt="" /></div>
              <div class="td">{{item.price}}</div>
              <div class="td">
                <div class="my-input-number">
                  <button :disabled="item.num <= 1" class="decrease" @click="sub(item.id)">-</button>
                  <span class="my-input__inner">{{item.num}}</span>
                  <button class="increase" @click="add(item.id)">+</button>
                </div>
              </div>
              <div class="td">{{item.num * item.price}}</div>
              <div class="td">
                <button @click="deleteItem(item.id)">删除</button>
              </div>
            </div>
          </div>
        </div>
        <!-- 底部 -->
        <div class="bottom">
          <!-- 全选 -->
          <label class="check-all">
            <input type="checkbox" v-model="allChecked"/>
            全选
          </label>
          <div class="right-box">
            <!-- 所有商品总价 -->
            <span class="price-box"
              >总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price"
                >{{totalPrice}}</span
              ></span
            >
            <!-- 结算按钮 -->
            <button class="pay">结算( {{totalCount}} )</button>
          </div>
        </div>
      </div>
      <!-- 空车 -->
      <div class="empty" v-else>🛒空空如也</div>
    </div>
    <script src="../js/vue.js"></script>
    <script>
      const defaultArr =[ {
              id: 1,
              icon: "../day02/static/img/火龙果.png",
              isChecked: true,
              num: 2,
              price: 6,
            },
            {
              id: 2,
              icon: "../day02/static/img/荔枝.png",
              isChecked: false,
              num: 7,
              price: 20,
            },
            {
              id: 3,
              icon: "../day02/static/img/榴莲.png",
              isChecked: false,
              num: 3,
              price: 40,
            },
            {
              id: 4,
              icon: "../day02/static/img/鸭梨.png",
              isChecked: true,
              num: 10,
              price: 3,
            },
            {
              id: 5,
              icon: "../day02/static/img/樱桃.png",
              isChecked: false,
              num: 20,
              price: 34,
            },];
      const app = new Vue({
        el: "#app",
        data: {
          // 水果列表
          fruitList:JSON.parse(localStorage.getItem('fruitList')) || defaultArr,
        },
        methods: {
          deleteItem(id) {
            this.fruitList = this.fruitList.filter(item => item.id !== id);
          },
          sub(id) {
            const fruit = this.fruitList.find(item => item.id === id);
            fruit.num--;
          },
          add(id) {
            const fruit =this.fruitList.find(item => item.id === id)
            fruit.num++;
          },
        },
        computed:{
          //默认计算属性  只能获取 不能设置 设置 得用完整写法
          // allChecked(){
          //   //必须所有的都选择了 全选 才选中 -》every
          //   return this.fruitList.every(item => item.isChecked);
          // }
          allChecked:{
            get(){
              return this.fruitList.every(item => item.isChecked);
            },
            set(value){
              //基于拿到的布尔值 让所有的小选框 同步状态
              this.fruitList.forEach(item => item.isChecked = value);
            }
          },
          totalCount(){
            return this.fruitList.reduce((sum,item) => item.isChecked? sum + item.num : sum,0);
          },
          totalPrice(){
            return this.fruitList.reduce((sum,item) => item.isChecked?sum + item.num * item.price:sum,0)
          }
        },
        watch:{
          deep:true,
          handler(newVal){
              //需要将变化后的newValue 存入本地  （转Json字符串）
            localStorage.setItem('fruitList',JSON.stringify(newVal));
          }
        }
      });
    </script>
  </body>
</html>
